Improvement in sheet-metal elbows



A. SYVERSON.

SHEET-METAL ELBOW.

No. 180,736. Patented Aug. 8, 1876.

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ANDREW SYVERSON, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF HIS RIGHT TO JOSEPH S. DENNIS, OF SAME PLACE.

IMPROVEMENT IN SHEET-METAL ELBOWS.

Specification forming part of Letters Patent N 0. 180,736, dated August 8, 1876; application filed December 9, 1874.

To all whom it may concern: duoed by forming the blank in the form shown Be it known that 1, ANDREW SYVERsoN, I below the dotted line in Fig. 4. When the' of Chicago, in the county of Cook and State pipe or section is thus bent, the edges which of Illinois, have invented a new, useful, and form the seam may be either soldered or riv- Improved Sheet-Metal-Elbowed Pipe, of eted together, regard being bad to the kind which the following is a full, clear, and exact of metal of which the pipe is made. When description, which will enable others skilled the pipe is made ofa metal which will admit in the art to which my invention appertains of soldering, the edges need not be lapped.

to make and use the same, reference being -I am aware that curved sheet-iron elbows had to the accompanying drawing, forming a alone, having smooth surfaces and only one part hereof, and in which seam, have heretofore been made; but two lgure l is a side elevation of my improved sections of pipe cannot be joined by means of elbowed pipe; Fig. 2, an elevation of that such elbows without producing at least three side of the same in which the seam lies; Fig. joints between the parts so united, whereas 3, a side elevation of a double-elbowed pipe, there will be only one joint when two sections and Fig. 4 a representation of the form of the of my elbowed pipe are united, as shown in blank. Fig. 3.

Like letters of reference indicate like parts. I am also aware that a smooth-surfaced,

The object of my invention is to make a curved sheet-iron elbow has been made from sheet-metal-elbowed pipein one piece, and hava blank of peculiar construction, as shown ing only one seam, which will be smooth both and described in Letters Patent N 0. 154,760, on its outer and inner surface, and the bent granted to George Lupton, September 8, 1874. part of which will lie in the arc of a circle, I am also aware that soft-metal tubes or or in a curved line. pipes made from blanks have been curved his I accomplish by making a sheet-metal Without being perceptibly crimped or corrublank in a proper form, and by then bending gated; but an uncrimped or uncorrugated and drawing the blank in such a manner that hard-metal pipe made from an ordinary blank, a smooth circular elbow is formed on the end and curved at the end, so as to form an elbow of the pipe or section of pipe; The edges of continuous therewith, and having only one seam, substantially as herein shown and described, has not, so far as I am aware, ever before been made.

I am also aware that both soft and hard tal elbowed pipes have been produced by casting the metal into such a form.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The blank A,of uniform thickness, adapted to form the elbow by being constructed substantially as specified.

2. The sheet-metal elbow, made of a single bland of sheet iron of uniform thickness, having a single longitudinal seam, the elbow being formed without crimping or cutting, and presenting a smooth surface throughout when finished, substantially as shown and described.

to each other when the metal will admit of soldering, and riveted when it will not.

In the drawing, A represents the form of the blank employed in constructing an elbowed pipe, formed in the manner shown in Figs. 1, 2, and 3. The upper end of the blank is curved, as shown, and, in the example represented, has pointed and curved projections at the junction of the upper and lateral edges. This blank is placed in a machine made for that purpose, and the vertical edges are crowded together, the upper part of the blank being at the same time drawn, so as to give a curved form to the upper end of the pipe or section of pipe, thus forming a continuous and smooth elbow thereon, having only one seam, as shown in Figs. 1 and 2. When the blank is made in this form the upper end of the completed elbow will be at right angles, or nearly so, to the lower end of the pipe or section. This angle, however, may be varied by varying the form of the blank, and an angle of about forty-five degrees may be pro- ANDREW SYVERSON. 

